Easily the most photographed site in all of Iceland, The Blue Lagoon is perhaps the
most supernatural looking body of water on Earth. Descriptions of its waters range
everywhere from the same color as the new Gatorade drink to frosty
blue. Though the latter term may sound good, the water in the lagoon is anything but
frosty. The temperature in the swimmable area averages
about 40C (104F), and the soothing, mineral-rich water is rumored
to have curative powers.

Though the lagoon looks like something born from Icelands otherworldly
landscape, it is actually man made. It was created by run-off from
the Svartsengi power plant, which
pumps up the geothermally heated water from a full mile below the
surface. After being used to generate both heat and electricity,
the excess (which is absolutely clean) is
ejected into the lagoon.